The symptoms of this fault are very obvious; there is a rattling noise coming from the DISA valve, SES light is lit and getting a lean mixture fault or rough running at idle. Displaying DTC codes and a loss in low end torque. There may be a rattling, buzzing or clicking noise coming from the engine. Fault codes: lean condition(P1083, P1085), front oxygen sensor lean (P1090, P1092) oxygen sensor slow response (P1087, P1089) and cylinder misfire (P0311-P0316) fuel control mixture lean (bank 2 sensor 1) and p0174 system too lean, showing?